<template>
  <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul class="menu-ul">
          <li v-for="(item,index) in goods" :key="index" class="menu-item border-1px" :class="{'current':currentIndex === index}" @click="selectMenu(index, $event)" ref="menuList">
            <span class="text"><span v-show="item.type>0" :class="classMap[item.type]" class="icon"></span>
            {{item.name}}</span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref=foodsWrapper>
        <ul class="foods-ul">
          <li v-for="(item,index) in goods" :key="index" class="food-list" ref="foodList">
            <h2 class="title">{{item.name}}</h2>
            <ul class="food-ul">
              <li @click="selectFood(food,$event)" v-for="(food,index) in item.foods" :key="index" class="food-item border-1px" >
                <div>
                  <img class="icon" :src="food.icon">
                </div>
                <div class="content">
                  <h3 class="name">{{food.name}}</h3>
                  <p class="desc"> {{food.description}} </p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span><span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol :food="food" @add="addFood"></cartcontrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shopcart ref="shopcart" :selectFoods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
      <food :food="selectedFood" ref="food"></food>
  </div>
</template>

<script>
import axios from 'axios'
import Vue from 'vue'
import BScroll from 'better-scroll'
import shopcart from '../shopcart/shopcart'
import cartcontrol from '../cartcontrol/cartcontrol'
import food from '../food/food'
Vue.prototype.$http = axios
const ERR_OK = 0
export default{
  props: {
    seller: {
      type: Object
    }
  },
  data () {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {},
      currentClickIndex: 0
    }
  },
  computed: {
    currentIndex () {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i]
        let height2 = this.listHeight[i + 1]
        // console.log('height1:' + height1 + ' ' + 'height2:' + height2)
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          this._followScroll(i)
          if (this.currentClickIndex === i) {
            return i
          } else {
            return this.currentClickIndex
          }
        }
      }
      return 0
    },
    selectFoods () {
      let foods = []
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food)
          }
        })
      })
      return foods
    }
  },
  created () {
    this.$http.get('/api/goods').then((response) => {
      response = response.data
      if (response.errno === ERR_OK) {
        this.goods = response.data
        this.$nextTick(() => {
          this._caculateHeight()
          this._initScroll()
        })
      }
    })
    this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee']
  },
  methods: {
    selectMenu (index, event) {
      if (!event._constructed) {
        return
      }
      let foodList = this.$refs.foodList
      let el = foodList[index]
      this.currentClickIndex = index
      this.foodsScroll.scrollToElement(el, 300)
    },
    selectFood (food, event) {
      if (!event._constructed) {
        return
      }
      this.selectedFood = food
      this.$refs.food.show()
    },
    addFood (target) {
      this._drop(target)
    },
    _drop (target) {
      this.$nextTick(() => {
        this.$refs.shopcart.drop(target)
      })
    },
    _initScroll () {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      })
      this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
        probeType: 3,
        click: true
      })
      this.foodsScroll.on('scroll', (pos) => {
        if (pos.y <= 0) {
          this.scrollY = Math.abs(Math.round(pos.y))
        }
      })
    },
    _caculateHeight () {
      let foodList = this.$refs.foodList
      let height = 0
      this.listHeight.push(height)
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i]
        height += item.clientHeight
        this.listHeight.push(height)
      }
    },
    _followScroll (index) {
      let menuList = this.$refs.menuList
      let el = menuList[index]
      this.menuScroll.scrollToElement(el, 300, 0, -100)
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food
  }
}
</script>
<style lang="stylus">
@import '../../common/stylus/mixin.styl'
  .goods
    display flex
    position absolute
    top 174px
    bottom 46px
    width 100%
    overflow hidden
    // overflow hidden
    .menu-wrapper
      flex 0 0 80px
      background #f3f5f7
      width 80px
      .menu-ul
        list-style-type none
        padding 0
        margin-top 0
        .menu-item
          display flex
          align-items center
          height 54px
          width 56px
          padding 0 12px
          line-height 14px
          &.current
            margin-top -1px
            background #fff
            font-weight 700
            .text
              border-none
          border-1px(rgba(7,17,27,0.1))
          .icon
            display: inline-block
            vertical-align: top
            width: 12px
            height: 12px
            margin-right: 2px
            background-size: 12px 12px
            background-repeat: no-repeat
            &.decrease
              bg-image('decrease_3')
            &.discount
              bg-image('discount_3')
            &.guarantee
              bg-image('guarantee_3')
            &.invoice
              bg-image('invoice_3')
            &.special
              bg-image('special_3')
          .text
            font-size 12px
            display table-cell
            width 56px
            vertical-align middle
    .foods-wrapper
      flex 1
      .foods-ul
        list-style-type none
        .title
          padding-left 14px
          height 26px
          line-height 26px
          border-left 2px solid #d9dde1
          font-size 12px
          color: rgb(147, 153, 159)
          background: #f3f5f7
        .food-ul
          list-style-type none
          .food-item
            display flex
            margin  18px
            padding-bottom 18px
            border-1px(rgba(7,17,27,0.1))
            &:last-child
              border-none
              margin-bottom 0
            .icon
              flex 0 0 57px
              margin-right 10px
            .content
              flex 1
              .name
                margin 2px 0 8px 0
                height 14px
                line-height 14px
                font-size 14px
                color rgb(7,17,27)
              .desc, .extra
                line-height: 12px
                font-size 10px
                color: rgb(147, 153, 159)
                margin-bottom 8px
              .desc
                line-height 12px
              .extra
                .count
                  margin-right 12px
              .price
                font-weight 700
                line-height 24px
                .now
                  margin-right 8px
                  font-size 14px
                  color rgb(240, 20, 20)
                .old
                  text-decoration line-through
                  font-size 10px
                  color rgb(147, 153, 159)
              .cartcontrol-wrapper
                position absolute
                bottom 12px
                right 0
</style>
